Reaktion #685000

Reaktionsgleichung

sodium hydroxide

hydrochloric acid

2-(2-(1-benzofuran-5-yl)ethoxy)-1-(3-hydroxy-1-pyrrolidinyl)-1-ethanone

water

→

achromatic oil

Ausbeute 72.6%

1-(2-(2-(1-benzofuran-5-yl)ethoxy)ethyl)-3-pyrrolidinol

Ausbeute 72.6%

Lösungsmittel

tetrahydrofuran

tetrahydrofuran

ethyl acetate

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added dropwise to the obtained solution
2. 2
   Temperaturwhile cooling on ice
3. 3
   Temperaturthe obtained mixture was heated
4. 4
   Temperaturto reflux for 1 hour
5. 5
   TemperaturAfter cooling
6. 6
   Sonstigean organic layer was separated
7. 7
   WaschenThe organic layer was successively washed with water
8. 8
   Trocknena saturated saline solution, and then dried over anhydrous magnesium sulfate
9. 9
   workup.DISTILLATIONThereafter, the solvent was distilled away under a reduced pressure
10. 10
    SonstigeThe residue was purified by column chromatography (eluent; chloroform:methanol=30:1 to 10:1)

Vorschrift

1.39 g of 2-(2-(1-benzofuran-5-yl)ethoxy)-1-(3-hydroxy-1-pyrrolidinyl)-1-ethanone was dissolved in 14.0 ml of tetrahydrofuran. Thereafter, 14.4 ml of a tetrahydrofuran solution containing a 1 mol/l borane-tetrahydrofuran complex was added dropwise to the obtained solution while cooling on ice, and the obtained mixture was then stirred at a room temperature for 17 hours. Thereafter, 8.0 ml of 6 mol/l hydrochloric acid was added to the reaction mixture, and the obtained mixture was heated to reflux for 1 hour. After cooling, water and ethyl acetate were added to the reaction mixture. The pH of the obtained mixture was adjusted to pH 10 by addition of a 2 mol/l aqueous sodium hydroxide solution, and an organic layer was separated. The organic layer was successively washed with water and a saturated saline solution, and then dried over anhydrous magnesium sulfate. Thereafter, the solvent was distilled away under a reduced pressure. The residue was purified by column chromatography (eluent; chloroform:methanol=30:1 to 10:1), so as to obtain 0.96 g of an achromatic oil product, 1-(2-(2-(1-benzofuran-5-yl)ethoxy)ethyl)-3-pyrrolidinol.

Quelle